Shane was unsure whether Umbra remembered a lot about his life before he had tamed him because Umbra was barely born at that time.
However, he was sure that his companion was fully aware of how helpless he had felt at that time and how much fear the place he was born had instilled within him.
Umbra had been weak, powerless and alone, without anyone to rely on for support until Shane had abducted him with force.
At that time, Shane had been sure that he would die, but Umbra's sheer desire to live had made the contrary happen.
With the help of Shane, he began to live without the need to fear something or someone, and live freely. Shane had never shackled or forcefully kept him bound to him so as to prevent him from escaping out of his clutches.